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Model connective tissue system: The effect of proteoglycan on the diffusional behavior of small non-electrolytes and microions

✍ Scribed by B. N. Preston; J. Mck. Snowden

Publisher
Wiley (John Wiley & Sons)
Year
1972
Tongue
English
Weight
935 KB
Volume
11
Category
Article
ISSN
0006-3525

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✦ Synopsis

Abstract

The diffusional behavior of low‐molecular‐weight solutes through gel membranes containing polyanionic material has been studied as a model for connective tissue. A steady‐state isotopic flux measurement is used. Results indicate that the presence of solutions of “native” proteoglycans within a gelatin‐agarose matrix has negligible effects on the diffusion of non‐electrolytes but markedly affects the behavior of ionic species. The permeabilities of counter‐and coions are discussed in terms of a Donnan equilibrium. It is evident that not all the counterions of the polyionic salt can be regarded as mobile in terms of the Donnan effect. The polyelectrolyte theories of Katchalsky et al. are applied to the behavior of the gel membranes to explain this observation. These quantitative interpretations suggest that counterion fixation by the proteoglycans occurs.

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